通过对苏州、泰州和南通等银杏产区的叶部病害调查及对致病菌的分离培养鉴定 ,发现危害银杏叶片的病害有 5种 :银杏黑斑病、炭疽病、叶斑病、环斑病和黄化病。经分离和鉴定的病原菌有 4种 :链格孢菌(Alternariasp .)、炭疽病 (Colletotrichumsp .)、叶点霉菌 (Phyllostictasp .)和盘多毛孢菌 (Pestalotiasp .)。进而对其发生规律进行了初步研究 Through the investigation of leaf diseases of Ginkgo biloba in Suzhou, Taizhou and Nantong, and the isolation and identification of pathogenic bacteria, it was found that there are 5 kinds of diseases which are harmful to ginkgo leaf: ginkgo black spot, anthracnose, leaf spot, Disease and yellow disease. There are 4 pathogenic bacteria isolated and identified: Alternaria sp., Colletotrichum sp., Phyllostictasp. And Pestalotiasp. And then the law of its occurrence has been preliminary studied